D-Link NetDefendOS User Manual page 488

1. Go to: Objects > ALG > Add > H.323 ALG
2. Specify a name for the ALG, in this case my_h323_alg
3. Click OK
Create a custom Service object for H.323:
1. Go to: Objects > Services > Add > TCP/UDP
2. Now enter:
• Name: my_h323_service
• Type: TCP
• ALG: my_h323_alg
• Destination port: 1720
3. Click OK
Create the outgoing traffic IP rule:
1. Go to: Policies > Firewalling > Main IP Rules > Add > IP Rule
2. Now enter:
• Name: H323AllowOut
• Action: Allow
• Source Interface: lan
• Source Network: lannet
• Destination Interface: any
• Destination Network: all-nets
• Service: my_h323_service
• Comment: Allow outgoing H.323 calls.
3. Click OK
Create the incoming traffic IP rule:
1. Go to: Policies > Firewalling > Main IP Rules > Add > IP Rule
2. Now enter:
• Name: H323AllowIn
• Action: Allow
• Source Interface: any
• Source Network: all-nets
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Chapter 6: Security Mechanisms